Question

The test-tube I contains sodium bicarbonate soultion whereas test-tube II contains lemon juice. On introducing pH paper strips in both the solutions, it is observed that the pH paper turns (1) red in I and blue in II
(2) blue in both (3) blue in I and red in II
(4) red in I and pink in II

Answer 1

Answer:

Option 3

Explanation:

Since lemon juice is acidic it turns pH to red

Answer 2

On introducing pH paper strips in both the solutions, it is observed that the pH paper turns blue in I and red in II.

Explanation:

Chemical formula of sodium bicarbonate is $NaHCO_{3}$ and it is a basic salt composed of strong base (NaOH) and weak acid ($H_{2}CO_{3}$).

For an acid, the color of blue litmus paper will change into red. And when a solution is basic in nature then the color of red litmus paper will change into blue. As a solution of sodium bicarbonate is basic in nature so it will turn pH paper into blue.

Whereas lemon juice is acidic in nature and it will turn pH paper into red.

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